If you want narrow, stock type wheels, check Jim Carter and Chevs of the 40s. Wheel Vintiques makes some that are wider, and I think they use stock caps (need to call them.) Summit racing carries some of their wheels. Coker tire has some in their catalog also. As Woogeroo said (or implied,) original wheels are your best bet..sandblasting and powder coating, just like new! Best of luck!
